I am statically linking to ImGui [1] on Win 10 x64, quite successfully till this issue came up. The noticed error so far comes when an ImGui function returns an ImVec2, a simple POD struct of two float members. I can use this struct as argument to functions but when it is returned from a function I get a 0xC0000005: Access violation reading location 0xFFFFFFFFFFFFFFFF. I can even debug the process with Visual Studion, mixed d and c++ sources. The functions I tested return data from some internal global ImGui data, which I can fully examine, the crash happens on the return statement. Moreover, some functions have variations which return only one component from that ImVec2 POD, which do work as expected, e.g.:

    ImVec2          GetCursorPos();   // crash
    float           GetCursorPosX();  // works
    float           GetCursorPosY();  // works

The latter do basically the same as the first one, but return ImVec.x or .y respectively.

How could I further debug this?
If somebody would be willing to look at the source, the binding is here [2].


[1] https://github.com/ocornut/imgui
[2] https://github.com/ParticlePeter/imgui_lib





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